In vitro characterisation of BF227 binding to α-synuclein/Lewy bodies

Michelle T. Fodero-Tavoletti, Rachel S. Mulligan, Nobuyuki Okamura, Shozo Furumoto, Christopher C. Rowe, Yukitsuka Kudo, Colin L. Masters, Roberto Cappai, Kazuhiko Yanai, Victor L. Villemagne

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Amyloid-β (Aβ) plaques are a pathological hallmark of Alzheimer's disease and a current target for positron emission tomography (PET) imaging agents. Whilst [11C]-PiB is currently the most widely used PET ligand in clinic, a novel family of benzoxazole compounds have shown promise as Aβ imaging agents; particularly BF227. We characterised the in vitro binding of [18F]-BF227 toward α-synuclein to address its selectivity for Aβ pathology, to establish whether [18F]-BF227 binds to α-synuclein/Lewy bodies, in addition to Aβ plaques. In vitro [18F]-BF227 saturation studies were conducted with 200 nM α-synuclein or Aβ1-42 fibrils or 100 μg of Alzheimer's disease, pure dementia with Lewy bodies or control brain homogenates. Non-specific binding was established with PiB (1 μM). In vitro binding studies indicated that [18F]-BF227 binds with high affinity to two binding sites on Aβ1-42 fibrils (KD1 = 1.31 and KD2 = 80 nM, respectively) and to one class of binding sites on α-synuclein fibrils (KD = 9.63nM). [18F]-BF227 bound to Aβ-containing Alzheimer's disease brain (KD = 25 ± 0.5 nM), but failed to bind to Aβ-free dementia with Lewy bodies or age-matched control homogenates. Moreover, BF227 labelled both Aβ plaques and Lewy bodies in immunohistochemical/fluorescence analysis of human Alzheimer's disease and Parkinson's disease brain sections, respectively. This study suggests that [18F]-BF227 is not Aβ-selective. Evaluation of BF227 as a potential biomarker for Parkinson's disease is warranted.

Original languageEnglish
Pages (from-to)54-58
Number of pages5
JournalEuropean Journal of Pharmacology
Volume617
Issue number1-3
DOIs
Publication statusPublished - 2009 Sep 1

Keywords

  • Aβ (amyloid-β)
  • BF227
  • Dementia with Lewy bodies
  • Imaging
  • Positron emission tomography
  • α-synuclein

ASJC Scopus subject areas

  • Pharmacology

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